Machinery Steels : 4140
4140 is a low alloy tool steel with high strength comprises of Chromium and molybdinum as main
content to enhance strength and quenching ability Also, it can increase surface hardness through
surface quenching. Grade 4140 is not fit for high temp application over 480c due to hardness which
significantly dropped rapidly. Moreover, tempering in the range of 230-270c is not recommended.
Since it will be fragile due to blue brittleness. Tempering should be done in the range lower.
Suggestion is 190c for 204 hours which provide best ductility enough for usage.
• High strength
• Resistance to fatigue.
• Resistance to abrasive
• Well to forgability.
• High Toughness
• Moderate in machining
• Easy in quenching and can be done by oil.
• Hardness can be achieved up to 60 HRC
• Can do induction
• Can do nitriding , hardness surface is about 650 HV
• Resistance to carbon loss at surface in moderate level.
4140 can be applied for machinery parts which require high strength such as powertrain, steering shaft
wheel shaft , piston shaft, oil boring bit, water pump part, high presure pipe, big size gear , flange, lock tool.
Also, popular among locomotive part, machinery shaft , pressure shaft, Hydraulic shaft , gear , screw
and bolt for oil and gas industry. Moreover, it can well perform for high strength machinery part.
| SCM 440
| 1.7225 / 42CrMo4
| อบอ่อน ความแข็งไม่เกิน 229 HB
| ชุบแข็ง และอบคืนตัว 55-60 HRC
ส่วนผสมทาง เคมี (%wt.)
|สภาพจําหน่าย Selling Condition
|สภาพหลังชุบ After Quenching
4140 คุณสมบัติทั่วไป (General Characteristic)